31 CFR §8.26

1. (a)Change in area of practice. At any time during a period of enrollment, an enrolled practitioner may apply to practice in a subject area or areas in which he or she was not previously qualified to practice (alcohol, tobacco, firearms, or explosives matters).
2. (b)Application. Each enrolled practitioner applying for a change in enrollment shall apply to the Director. The enrolled practitioner shall include in the application all information required by § 8.22 but shall include information relating to technical qualifications only in those additional subject areas in which he or she is applying to practice.
3. (c)Fee. Each application for change in enrollment will be accompanied by a check or money order in the amount of $5, payable to the Bureau of Alcohol, Tobacco and Firearms.